[Bug gas/30752] New: RFE: Z80: allow relaxed syntax of instructions using register A

[hpa at zytor dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30752

            Bug ID: 30752
           Summary: RFE: Z80: allow relaxed syntax of instructions using
                    register A
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: hpa at zytor dot com
  Target Milestone: ---

In the official Z80 syntax, register A is supposed to be written out when, and
only when, the same instruction takes other operands, like HL:

    ADD A,L          ; Because ADD HL,DE
    XOR L            ; No other XOR

In practice, this is needlessly confusing for the programmer; as a result, many
(probably most) legacy Z80 assemblers allow:

    ADD L

... and at least some also allow ...

    XOR A,L

Allowing this relaxed syntax would definitely help porting legacy code.

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